Questions about EQ (slope, node tree restrictions)

[Morphoice]

1. is there a way to set the slope of a low/high cut? what is the actual slope? 6dB? 12dB? Is the curve accurate or an approximation? I can only get the curve steeper via the Q parameter, but that also makes a boosting bump

2. why can't I add a parametric EQ to a waveform generator's FX section? It only works on a Synthesizer Group. A scriptnode fx is possible, however.

3. does stacking filters.svf_eq scriptnodes have the same CPU cost as all the bands on the parametric EQ? they seem to have the identical function, then that would be a suitable workaround

[Matt_SF]

1. Nope, the actual slope is 12dB/octave. You can increase the slope by chaining multiple filters in serie.

2. The EQ is not polyphonic. If you put the WFgen in a Synth goup, you have to put the EQ in the Synth group's FX chain. The FX in the WFgen only accepts polyphonic effects == the FX are applied on each voice.
   If you're using a WFgen not in a Synth group, you can add the EQ.

3. Unless you're using 50 svf_eqs, I guess the difference doesn't matter

[aaronventure]

@Morphoice said in Questions about EQ (slope, node tree restrictions):

does stacking filters.svf_eq scriptnodes have the same CPU cost as all the bands on the parametric EQ? they seem to have the identical function, then that would be a suitable workaround

Yes, if you're using the SVF Parametric EQ preporcessor. Otherwise the parametric EQ is biquad, which has about 20% lighter CPU hit.

[aaronventure]

Also you can make a variable slope filter by controlling dry/wet of individual filters in the series past the first one.

Some notes about the snippet:

• probably better to handle it in a script where you mathematically specify the sections
• There's no perfect crossfade using the Xfader which is why the response dances up/down

X-fader needs a true equal power curve (you can confirm that RMS isn't perfect just by crossfading two identical signals. Having a curve output that allows for instant serial addition like this could also be cool.

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[Matt_SF]

@aaronventure said in Questions about EQ (slope, node tree restrictions):

X-fader needs a true equal power curve

Alternatively you can use linear Xfading and math.mul nodes :

[aaronventure]

@Matt_SF that's so stupidly simple, thanks

[Mighty23]

@Morphoice said in Questions about EQ (slope, node tree restrictions):

is there a way to set the slope of a low/high cut? what is the actual slope? 6dB? 12dB? Is the curve accurate or an approximation? I can only get the curve steeper via the Q parameter, but that also makes a boosting bump

• one pole =-> 6db/ octave
• ladder filter & moog -> 4 pole -> 24db/octave
• Linkwitz-Riley filters -> 4 pole -> 24db/octave
• other filter is 2 pole -> 12dB/octave
  https://forum.hise.audio/topic/8784/qol-write-slope-information-for-each-filter-node-in-scriptnode-and-filterfx

JUCE MODULES: dsp::LinkwitzRileyFilter< SampleType > Class Template Reference

(ccrma.stanford.edu)